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H2S + 2HNO3 → S(colloidal solution) + 2H2O + 2NO2 Which type of reaction is this to produce a colloidal solution?

H2S + 2HNO3 → S(colloidal solution) + 2H2O + 2NO2 Which type of reaction is this to produce a colloidal solution? Correct Answer Oxidation

The correct answer is Oxidation.

Concept: 

  • The colloidal state is the state of subdivision in which molecules or polymolecular particles having at least one dimension in the range of 1 nanometre and 1 micrometer, are dispersed in some medium.
  • It is prepared by using different chemical processes.
    • By Double decomposition:
      • As2O3 + H2S → As2S3 + 3H20
    • By Hydrolysis:
      • FeCl3 + 3H2O → Fe(OH)3 + 3HCl
    • By Oxidation:
      • H2S + 2HNO3 → S(colloidal solution) + 2H2O + 2NO2
    • By reduction:
      • ​2AuCl3 + 3SnCl2 → 3SnCl4 + 2Au (gold sol)

Explanation:

  • Given reaction is the oxidation reaction. 
  • In which Sulphur colloidal solution is formed.
  • Oxidation of sulphur takes place in this reaction.

​​Notes:

  • Oxidation:
    • ​Oxidation may be defined as the loss of electrons from an element. 
    • Addition of oxygen or the more electronegative element or removal of hydrogen or the more electropositive element from an element.
    • 2S(s) + O2 (g) → SO2 (g)
  • Reduction:
    • ​Reduction reactions are defined as the gain of electrons.
    • Addition of hydrogen or more electropositive element or removal of a more electronegative element or oxygen from an element.
    • 2CH2CH2 (g) + H2 (g) → CH3CH3 (g)
  • Redox:
    • Oxidation and reduction both performed in a reaction.

[ alt="redoxeqtn1" of oxidation and reduction src="https://www.chemguide.co.uk/inorganic/redox/redoxeqtn1.gif" style="height: 92px; width: 300px;">

 

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